Objective To evaluate the predictive ability of carotid corrected flow time(FTc)and carotid peak flow varia-bility(△Vpeak)for stroke volume variation(SVV)≥13％during induction of mechanical ventilation under general an-aesthesia in elderly patients.Methods A total of 60 patients undergoing laparoscopic gastrointestinal surgery at Hefei First People's Hospital from July 2021 to December 2022 were selected.The ultrasound parameters and hemodynamic pa-rameters were measured 5 min after endotracheal intubation(T1).SVV ≥ 13％was defined as responder group(R group);SVV＜13％was defined as non-responder group(N group).Finally,30 patients were included in the R and N group,respectively.Five minutes after the volume loading test(T2),the same hemodynamic parameters were measured.Pearson correlation coefficient was used to analyze the correlation between ultrasound parameters and SVV.ROC curve was used to evaluate the ability of FTc and △Vpeak to predict SVV ≥ 13％.Results FTc in group R was significantly lower than that in group N from T0(before induction of anesthesia)to T2,while △Vpeak was significantly higher than that in group N(P＜0.05).FTc at T2 was significantly higher than that at T0,whereas △Vpeak at T2 was significantly lower than that at T0 in both groups(P＜0.05).FTc predicted SVV≥ 13％with 83.3％sensitivity and 76.7％specifici-ty.△Vpeak predicted SVV ≥13％with 80.0％sensitivity and 63.3％specificity.Pearson correlation analysis showed that the correlation coefficient between FTc and SVV was-0.674,indicating a negative correlation between FTc and SVV.The correlation coefficient between △Vpeak and SVV was 0.765,indicating that there was a positive correlation be-tween △Vpeak and SVV.Conclusion FTc and △Vpeak correlate well with SVV.Both FTc and △Vpeak can predict flu-id responsiveness during general anaesthesia in elderly patients.
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